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DEBT - $98M Credit Facility (Details)
$ in Thousands
Nov. 10, 2015
USD ($)
Nov. 04, 2015
USD ($)
subsidiary
item
Sep. 30, 2016
USD ($)
Jun. 29, 2016
USD ($)
Jun. 28, 2016
Dec. 31, 2015
USD ($)
Line of Credit Facility            
Debt classified as current liability     $ 540,455     $ 579,023
$98 Million Credit Facility Commitment Letter            
Line of Credit Facility            
Maximum borrowing capacity     98,000      
Collateral security maintenance test (as a percent)       120.00% 140.00%  
$98 Million Credit Facility Commitment Letter | Minimum            
Line of Credit Facility            
Minimum cash requirement through the end of the waiver period       $ 25,000    
Line of Credit Facility | $98 Million Credit Facility            
Line of Credit Facility            
Maximum borrowing capacity   $ 98,000 98,000     98,000
Fixed amortization payment for the first two years   $ 0        
Number of wholly owned subsidiaries | subsidiary   13        
Drawdowns during the period $ 98,271          
Remaining borrowing capacity     0      
Long-term Debt     96,277     95,903
Debt classified as current liability     96,277      
Period without fixed amortization schedule   2 years        
Amount of periodic payment   $ 2,500        
Maximum collateral required for prepayment of loan (as a percent)   182.00%        
Number of collateral vessels | item   13        
Restricted cash     9,750     $ 9,750
Line of Credit Facility | $98 Million Credit Facility | LIBOR            
Line of Credit Facility            
Reference rate for interest payable   three-month LIBOR        
Applicable margin over reference rate (as a percent)   6.125%        
Line of Credit Facility | $98 Million Credit Facility Commitment Letter            
Line of Credit Facility            
Maximum borrowing capacity     $ 98,000 $ 98,000